Workflows - Viewer

Open the fullscreen viewer by clicking on a thumbnail.

Action	Shortcut or gesture
Next photo	Right Arrow
Previous photo	Left Arrow
Zoom in or out	Pinch on the trackpad, or use + and -
Pan while zoomed	Drag
Close viewer	Esc
Move the photo to a section	T, C, K, E, or R
Toggle windowed/fullscreen mode	Shift+Cmd+F

By default, the fullscreen viewer stays on the current macOS Space. You can change that in Settings.